/// <summary>
/// Determines whether the assembly was compiled without optimizations using the DebuggableAttribute
/// </summary>
public static bool HasOptimizationsDisabled(this EcmaAssembly assembly)
{
bool result = false;
MetadataReader reader = assembly.MetadataReader;
var attributeHandles = assembly.AssemblyDefinition.GetCustomAttributes();
CustomAttributeHandle attributeHandle = reader.GetCustomAttributeHandle(attributeHandles, "System.Diagnostics", "DebuggableAttribute");
if (!attributeHandle.IsNil)
{
CustomAttribute attribute = reader.GetCustomAttribute(attributeHandle);
CustomAttributeValue <TypeDesc> decoded = attribute.DecodeValue(new CustomAttributeTypeProvider(assembly));
if (decoded.FixedArguments.Length == 1)
{
// DebuggableAttribute( DebuggableAttribute.DebuggingModes modes )
if (!(decoded.FixedArguments[0].Value is int))
{
ThrowHelper.ThrowBadImageFormatException();
}
DebuggableAttribute.DebuggingModes modes = (DebuggableAttribute.DebuggingModes)decoded.FixedArguments[0].Value;
result = modes.HasFlag(DebuggableAttribute.DebuggingModes.DisableOptimizations) && modes.HasFlag(DebuggableAttribute.DebuggingModes.Default);
}
else if (decoded.FixedArguments.Length == 2)
{
// DebuggableAttribute( bool isJITTrackingEnabled, bool isJITOptimizerDisabled )
if (!(decoded.FixedArguments[0].Value is bool) || !(decoded.FixedArguments[1].Value is bool))
{
ThrowHelper.ThrowBadImageFormatException();
}
result = ((bool)decoded.FixedArguments[1].Value);
}
}
return(result);
}
/// <summary>
/// Returns the TargetFrameworkIdentifier of an assembly, or null if not found
/// </summary>
public static string GetTargetFrameworkIdentifier(this AssemblyDefinition assembly, MetadataReader reader)
{
foreach (var handle in assembly.GetCustomAttributes())
{
var attribute = reader.GetCustomAttribute(handle);
var name = reader.GetCustomAttributeFullName(attribute);
if (name == "System.Runtime.Versioning.TargetFrameworkAttribute")
{
var arguments = attribute.GetCustomAttributeArguments();
foreach (var p in arguments.FixedArguments)
{
// Of the form "MonoAndroid,Version=v8.1"
var value = p.Value?.ToString();
if (!string.IsNullOrEmpty(value))
{
int commaIndex = value.IndexOf(",", StringComparison.Ordinal);
if (commaIndex != -1)
{
return(value.Substring(0, commaIndex));
}
}
}
return(null);
}
}
return(null);
}
private MethodImportAttributes GetImportAttributesFromBestFitMappingAttribute(CustomAttributeHandleCollection attributeHandles)
{
// Look for the [BestFitMapping(BestFitMapping: x, ThrowOnUnmappableChar = y)] attribute and
// translate that to MethodImportAttributes
MethodImportAttributes result = 0;
MetadataReader reader = MetadataReader;
CustomAttributeHandle attributeHandle = reader.GetCustomAttributeHandle(
attributeHandles, "System.Runtime.InteropServices", "BestFitMappingAttribute");
if (!attributeHandle.IsNil)
{
CustomAttribute attribute = reader.GetCustomAttribute(attributeHandle);
CustomAttributeValue <TypeDesc> decoded = attribute.DecodeValue(
new CustomAttributeTypeProvider(_type.EcmaModule));
if (decoded.FixedArguments.Length != 1 || !(decoded.FixedArguments[0].Value is bool))
{
ThrowHelper.ThrowBadImageFormatException();
}
if ((bool)decoded.FixedArguments[0].Value)
{
result |= MethodImportAttributes.BestFitMappingEnable;
}
else
{
result |= MethodImportAttributes.BestFitMappingDisable;
}
foreach (CustomAttributeNamedArgument <TypeDesc> namedArg in decoded.NamedArguments)
{
if (namedArg.Name == "ThrowOnUnmappableChar")
{
if (!(namedArg.Value is bool))
{
ThrowHelper.ThrowBadImageFormatException();
}
if ((bool)namedArg.Value)
{
result |= MethodImportAttributes.ThrowOnUnmappableCharEnable;
}
else
{
result |= MethodImportAttributes.ThrowOnUnmappableCharDisable;
}
break;
}
}
}
return(result);
}